Multiple data in each cell in JTable

Hi,
I'm currently working on a program where I need to a JTable that can contain multiple data in each cell. I,ve solved this problem so far by making each cell contain a JList to hold the data, but I'm a little concerned about performance issues. Lets say I have a table with 10x10 cells, that would make 100 JList to render! So my question is if there is a better more light weight way of having multiple data in a JTable cell?
a screendump of the layout can be seen here
/Peter

In the future, Swing related questions should be posted in the Swing forum.
First of all it looks like you have a working program, so are you experiencing any renderering problems?
The only suggesion I would make is to store the ListModel in the table not the JList. I don't think this will improve the renderering, but it should save on resources as you don't need to create multiple JLists.
Or maybe you use JLabels on a panel with a GridLayout.
Or, if you data isn't dynamic, then maybe you create and store an image of each cell and then just use the default renderer.

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I wish to list consectutive dates in a column. How do I do this without having to enter each date in each cell?

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Hi pdh,
Enter the first date. I typed 23 feb. Numbers adds the year (if you want a different year, type that as well).
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BPS Web Interface don't show multiple documents for each cell

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@ REPORT     -      DD/MM/YY                                         --> 5/6/140
So you can check these properties at respective levels and do the necessary changes as per requirement
- M

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How to find out each Cell having Data or Not in Excel File by Using WDJ

Hi Friends,
I have one doubt on WDJ.
I have to Upload Excel File. Click on Upload Button in Excel file Data will move to One Bapi. This is I was done. But my Requirement is if any empty Cell in Excel That File not uploaded it display one error message Please upload Correct Excel File
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By Using this Code I have Upload Excel File
InputStream text = null;
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               File file = new File(wdContext.currentContextElement().getResource().getResourceName().toString());
FileOutputStream op = new FileOutputStream(file);
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                              path = file.getAbsolutePath();
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Hi my friend
I would like to share you some APACHE APi´s that i use when i have to read excel files in Web Dynpro.
JAR = poi-3.2-FINAL-20081019.jar
Some Example:
POIFSFileSystem fs;
HSSFWorkbook wb;
HSSFSheet sheet;
String myMexican_ValueFromExcelis = "";
try {
         fs = new POIFSFileSystem(new FileInputStream();
         // and select the cell "y"
        cell = row.getCell( 0 );
        myMexican_ValueFromExcelis = cell.getCellValue();
}cach(Exception e){
REgargds

JTable custom cell renderer for each cell

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Hi,
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I have created Seperate Node CellColorNode with attribue CellClr1 and CellClr2 of type TextView Semantic Color.
Set the calculated, read only attribute to True. Mapped table columns text view to the CellColorNode->CellClr1 and CellColorNode-->CellClr2 correspondingly.
Now, my query is how do i set the colors to CellClr1 and CellClr2 attributes. As I need to set the color for multiple columns of each table row.
Is it in method getColorCellCellClr generated? Any Example Code?

Its resolved by following below link
http://scn.sap.com/thread/158286

Dragging only a portion of data from a cell?

I'm working on a scheduling program (using Java/Swing) that simply has several tables that I drag and drop information pulled from a database. In one table I have it set up so that the user can drag multiple data (people�s names) into a single cell (just concatenate the new name with the existing names). However, I now need the ability to drag a specific name outside the table (to delete it). Since I treat the contents of the whole cell as one big string, I'm stumped as what to do next. I'm new to Java, but have been reading about custom renderers and was wondering if it would be possible to write one that would work in my situation. I'm also open to any other ways that would make specific selection possible. So far this is what has been suggested:
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- write a cell renderer so that you can highlight specific names in a cell when the mouse is clicked on one
- add your drag and drop code using the above two features
Any help would be greatly appreciated.

I'm working on a scheduling program (using
Java/Swing) that simply has several tables that I
drag and drop information pulled from a database. In
one table I have it set up so that the user can drag
multiple data (people�s names) into a single cell
(just concatenate the new name with the existing
names). However, I now need the ability to drag a
specific name outside the table (to delete it). Since
I treat the contents of the whole cell as one big
string, I'm stumped as what to do next. I'm new to
Java, but have been reading about custom renderers
and was wondering if it would be possible to write
one that would work in my situation. I'm also open to
any other ways that would make specific selection
possible. So far this is what has been suggested:
- find a method of detecting which name is underneath
the mouse when a cell is clicked on. You'd need a
custom table model such that every cell returns some
collection of custom objects representing each name.
- write a cell renderer so that you can highlight
specific names in a cell when the mouse is clicked on
one
- add your drag and drop code using the above two
features
Any help would be greatly appreciated.I made a cell renderer that is a JPanel subclass that stores JLabels (each representing a name) and the labels will be laid out using a FlowLayout in the panel - that way the names "wrap" in the table cell. Now I need to create a method in my JPanel subclass to return which component is at (x,y), and highlight that component in my renderer getCellRenderComponent() method.
Any ideas how to implement this method?

JLabel as cell of JTable

Hi All,
I am using JLabel as a cell of a JTable by overriding getTableCellRendererComponent method of the renderer.But I am not able to select/focus on any of the cell by clicking at cells.However If I use any other componenet like JTextArea, I can select any cell I want.
I have to use JLabel because i want to put multiple color and fonts in a single cell.I dont't want to use JTextPane because it takes more memory as well as It has wraping problem
Any help would be greatly appreciated

It's not a good idea to create a NEW Component each and every time getXXXCellRenderer() is called. Object creation is VERY expensive!!!
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I have reworked your code to make it much more efficient, and to make it more readable:
public class MyTableCellRenderer
    implements TableCellRenderer
    JLabel label = new JLabel();
    public MyTableCellRenderer()
        super();
        this.label.setOpaque(true);
    public Component getTableCellRendererComponent( JTable table,
                                                    Object value,
                                                    boolean isSelected,
                                                    boolean hasFocus,
                                                    int     row,
                                                    int     column )
        String st=null;
        st="<HTML><B><FONT Color=Red>" + value.toString()
           + "</FONT></B></HTML>";
        this.label.setText(st);
        if (isSelected) {
            this.label.setBackground( table.getSelectionBackground());
        } else {
            this.label.setBackground(Color.yellow);
        return this.label;
}You may find that using HTML as the text of JLabel is much too expensive, especially with a large table. I tried it once, with a table of only moderate size, and gave up. It's much faster to set the font, foreground color, etc., on the JLabel itself instead.
I was trying to use HTML simply to get HTML Character Entities (like &) to display correctly, and it just didn't work. I wrote my own class to parse strings for HTML Character Entities, replacing them with appropriate Unicode characters, and it worked much better.
---Mark

How do i do that? MultiLine in a cell of JTable !!!

Dear friends,
I am trying to add multiline in a cell of JTable. For that bellow code i have written, but my statement in cell displays in a line only. Code is given bellow (copy/paste/run), could anyone help me how to do that?
Regards..
Jaya.
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.swing.JOptionPane;
import java.awt.*;
import java.awt.event.*;
import javax.swing.border.*;
import javax.swing.table.*;
import java.sql.*;
public class OtL extends JFrame {
    public OtL()
      initComponents();
    private void initComponents() {
        model1 = new DefaultTableModel();
        btnClose = new javax.swing.JButton();
        tblOt       = new javax.swing.JTable(model1);
        scrOt   = new javax.swing.JScrollPane();
        TableCellRenderer renderer = new TableRenderer();
        tblOt.setDefaultRenderer(Object.class,renderer);
        tblOt.setRowHeight(tblOt.getRowHeight()*3);
        tblOt.setBackground(new java.awt.Color(250,225,162));
        getContentPane().setLayout(null);
        addWindowListener(new java.awt.event.WindowAdapter() {
            public void windowClosing(java.awt.event.WindowEvent evt) {
                exitForm(evt);
        btnClose.setText("CLOSE");
        btnClose.setToolTipText("Close This Screen");
        btnClose.setBorder(new javax.swing.border.BevelBorder(javax.swing.border.BevelBorder.RAISED));
        btnClose.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
              System.exit(0);
        getContentPane().add(btnClose);
        btnClose.setBounds(380, 470, 110, 25);
        tblOt.setToolTipText("Operation Theatre Booking List");
        scrOt.setViewportView(tblOt);
        tableSize();
        scrOt.setBorder(new javax.swing.border.LineBorder(new java.awt.Color(0, 0, 0)));
        scrOt.setToolTipText("Operation Theatre Booking List");
        getContentPane().add(scrOt);
        scrOt.setBounds(15, 150, 770, 300);
        displayOtList();
    private void exitForm(java.awt.event.WindowEvent evt) {
        System.exit(0);
    public static void main(String args[]) {
        JFrame j = new OtL();
        j.setSize(800,560);
        j.show();
/**********Code for displaying Operation Theater Booking List****Start Here*************/
    public void displayOtList(){
Here i fire a sql query and i populate data in table.
Sometime i get more than 1 value for some column e.g Surgery Name and Surgeon Name, so
i want to display more than 1 value in the same cell. like bellow i have mentiond for
5th and 6th column. But its displayin in one line only, how can i display that in multiple line!!
I know that can be taken care with Renderer, i tried but couldn't go through. I have written TableRenderer
class for that, please help me what should i do in Renderer class.
      int row1=0;
      tableSize();
      DefaultTableModel model1 = (DefaultTableModel)tblOt.getModel();
      Object[] newRow = new Object[6];
        for(int i=0;i<1;i++){
          row1 = tblOt.getRowCount() + 1;
          newRow[0] = "1";
          newRow[1] = "10:10";
          newRow[2] = "11:30";
          newRow[3] = "Name Here";
          newRow[4] = "Surgery Name1 \n Surgery Name2";
          newRow[5] = "Dr. Amit \n Dr. Johnson";
          model1.addRow(newRow);
/**********Code for displaying Operation Theater Booking List****End Here*************/
   class TableRenderer extends DefaultTableCellRenderer{
     public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean
hasFocus, int row, int column)
       super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
      setOpaque(true);
       return this;
/******tableSize()*****code for sizing table******start here()********/
public void tableSize(){
    tblOt.setModel(new javax.swing.table.DefaultTableModel(
        new Object [][] {},
        new String [] {"Ot No.", "Start Time","End Time", "Patient Name", "Surgery Name","Surgeon Name"}
    TableColumn column = null;
    for (int i = 0; i < 6; i++) {
      column = tblOt.getColumnModel().getColumn(i);
      if (i == 0) {
        column.setPreferredWidth(5);
      if (i == 1) {
        column.setPreferredWidth(15);
      if (i == 2) {
      column.setPreferredWidth(15);
      if (i == 3) {
        column.setPreferredWidth(130);
      if (i == 4) {
        column.setPreferredWidth(130);
      if (i == 5) {
        column.setPreferredWidth(130);
/******tableSize()*****code for sizing table******end here()********/
    private javax.swing.JButton btnClose;
    private javax.swing.JScrollPane scrOt;
    private javax.swing.JTable tblOt;
    private DefaultTableModel model1;
[\code]

OK Filne, Thanx .. its displaying data in multiple line now.
But still there is a problem, whenever i move mouse over the table row it returns error like bellow. I am not able to findout the reason of error. I tried to put code in try{} catch{} block to avoid this error, but still its coming. Help me.....!!!!!!!!
java.lang.NullPointerException
        at javax.swing.text.View.getViewIndex(View.java:1060)
        at javax.swing.text.View.getToolTipText(View.java:1031)
        at javax.swing.plaf.basic.BasicTextUI.getToolTipText(BasicTextUI.java:1057)
        at javax.swing.text.JTextComponent.getToolTipText(JTextComponent.java:1533)
        at javax.swing.JTable.getToolTipText(JTable.java:2380)
        at javax.swing.ToolTipManager$insideTimerAction.actionPerformed(ToolTipManager.java:669)
        at javax.swing.Timer.fireActionPerformed(Timer.java:256)
        at javax.swing.Timer$DoPostEvent.run(Timer.java:190)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:167)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:437)
        at java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:150)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:131)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)my latest programe code is here :
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.border.*;
import javax.swing.table.*;
public class OtL extends JFrame {
    public OtL()
      initComponents();
    private void initComponents() {
        model1 = new DefaultTableModel();
        btnClose = new javax.swing.JButton();
        tblOt       = new javax.swing.JTable(model1);
        scrOt   = new javax.swing.JScrollPane();
        TableCellRenderer renderer = new TableRenderer();
        tblOt.setDefaultRenderer(Object.class,renderer);
        tblOt.setRowHeight(tblOt.getRowHeight()*3);
        tblOt.setBackground(new java.awt.Color(250,225,162));
        getContentPane().setLayout(null);
        addWindowListener(new java.awt.event.WindowAdapter() {
            public void windowClosing(java.awt.event.WindowEvent evt) {
                exitForm(evt);
        btnClose.setText("CLOSE");
        btnClose.setBorder(new javax.swing.border.BevelBorder(javax.swing.border.BevelBorder.RAISED));
        btnClose.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
              System.exit(0);
        getContentPane().add(btnClose);
        btnClose.setBounds(380, 470, 110, 25);
        scrOt.setViewportView(tblOt);
        tableSize();
        scrOt.setBorder(new javax.swing.border.LineBorder(new java.awt.Color(0, 0, 0)));
        getContentPane().add(scrOt);
        scrOt.setBounds(15, 150, 770, 300);
        displayOtList();
    private void exitForm(java.awt.event.WindowEvent evt) {
        System.exit(0);
    public static void main(String args[]) {
        JFrame j = new OtL();
        j.setSize(800,560);
        j.show();
    public void displayOtList(){
      int row1=0;
      tableSize();
      DefaultTableModel model1 = (DefaultTableModel)tblOt.getModel();
      Object[] newRow = new Object[6];
        for(int i=0;i<1;i++){
          row1 = tblOt.getRowCount() + 1;
          newRow[0] = "1";
          newRow[1] = "10:10";
          newRow[2] = "11:30";
          newRow[3] = "Name Here";
          newRow[4] = "Surgery Name1 \n Surgery Name2";
          newRow[5] = "Dr. Amit \n Dr. Johnson";
          model1.addRow(newRow);
   class TableRenderer extends JTextArea implements TableCellRenderer{
      public TableRenderer(){
        setLineWrap(true);
        setWrapStyleWord(true);
        setOpaque(true);
     public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean
hasFocus, int row, int column)
      if (isSelected) {
        setForeground(tblOt.getSelectionForeground());
        setBackground(tblOt.getSelectionBackground());
      } else {
        setForeground(tblOt.getForeground());
      setFont(tblOt.getFont());
      if (hasFocus) {
        setBorder( UIManager.getBorder("Table.focusCellHighlightBorder") );
          if (tblOt.isCellEditable(row, column)) {
            setForeground( UIManager.getColor("Table.focusCellForeground") );
            setBackground( UIManager.getColor("Table.focusCellBackground") );
          } else {
        setBorder(new EmptyBorder(1, 2, 1, 2));
      setText((value == null) ? "" : value.toString());
      return this;
/******tableSize()*****code for sizing table******start here()********/
public void tableSize(){
    tblOt.setModel(new javax.swing.table.DefaultTableModel(
        new Object [][] {},
        new String [] {"Ot No.", "Start Time","End Time", "Patient Name", "Surgery Name","Surgeon Name"}
    TableColumn column = null;
    for (int i = 0; i < 6; i++) {
      column = tblOt.getColumnModel().getColumn(i);
      if (i == 0) {
        column.setPreferredWidth(5);
      if (i == 1) {
        column.setPreferredWidth(15);
      if (i == 2) {
      column.setPreferredWidth(15);
      if (i == 3) {
        column.setPreferredWidth(130);
      if (i == 4) {
        column.setPreferredWidth(130);
      if (i == 5) {
        column.setPreferredWidth(130);
/******tableSize()*****code for sizing table******end here()********/
    private javax.swing.JButton btnClose;
    private javax.swing.JScrollPane scrOt;
    private javax.swing.JTable tblOt;
    private DefaultTableModel model1;
}

Date Format problem in a JTable, help plzzz !!!

Hi,
i have a JTable which contains multiple date columns, and more particulary, Timestamp columns.
I mean this format : yyyy-mm-dd hh:mm:ss.fffffffff
I only need hh:mm:ss informations for my JTable.
The problem is when i retrieve the datas in the JTable (which has a bean Select for model), the date column has this format : yyyy-mm-dd (only the date), and the time is not present !
What must i do to have only a part of the timestamp data in the column ??
Thanks in advance
Steve

If you want to format data in any way other than the default in a JTable, you need a table cell renderer. Sun's tutorial on how to use JTables explains them.

Sorting colored cell in JTable

First, i'm sory for my bad english
I've made a JTable that have a column contains different colored cell each row depend on value at that cell. Like some post at many forums, I'm using DefaultTableCellRenderer with overiding getTableCellRendererComponent() and calling setBackground(Color c) from that return Component object .
At the first time data loaded into table, all is working well (each cell has their suitable color), but when I sort the table by clicking their header, the bacground color still at the fix cell (not sorted)
Any idea for this?
Thnks before.

Thanx to Axel.
Yes, right, it's working in TableSorterDemo.java
that code coloring the cell depen on its value
but my app need to be colored only at specific column, so i need the value of column
i just try to modify at your code like this:
         table.setDefaultRenderer(Integer.class, new DefaultTableCellRenderer() {
             public Component getTableCellRendererComponent (JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
                 Component cell = super.getTableCellRendererComponent (table, value, isSelected, hasFocus, row, column);
                 cell.setBackground(Color.white);
                 if(value instanceof Integer) {
                     if ((new Integer(5)).equals(value)) {
                         cell.setBackground(Color.yellow);
                     } else if((new Integer(3)).equals(value)) {
                         cell.setBackground(Color.green);
                     } else if((new Integer(20)).equals(value)) {
                         cell.setBackground(Color.red);
                 if(column == 0){ //not working, n it should not :D
                cell.setBackground(Color.red);
                 return cell;
but, didn't work
so i set the CellRenderer using column approach in my app, like this:
DefaultTableCellRenderer leftCellRenderer = new DefaultTableCellRenderer() {
            @Override
            public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
                Component cell = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
                super.setHorizontalAlignment(SwingConstants.LEFT);
                return cell;
        DefaultTableCellRenderer centerCellRenderer = new DefaultTableCellRenderer() {
            @Override
            public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
                Component cell = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
                super.setHorizontalAlignment(SwingConstants.CENTER);
                return cell;
        DefaultTableCellRenderer coloredCellRenderer = new DefaultTableCellRenderer() {
            @Override
            public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
                Component cell = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
                super.setHorizontalAlignment(SwingConstants.CENTER);
                if (value.equals(" ")) {
                    cell.setBackground(Color.GREEN);
                } else {
                    cell.setBackground(Color.RED);
                return cell;
        myTable.getColumnModel().getColumn(1).setCellRenderer(leftCellRenderer);
        myTable.getColumnModel().getColumn(0).setCellRenderer(centerCellRenderer);
        myTable.getColumnModel().getColumn(2).setCellRenderer(centerCellRenderer);
        myTable.getColumnModel().getColumn(3).setCellRenderer(centerCellRenderer);
        myTable.getColumnModel().getColumn(4).setCellRenderer(coloredCellRenderer);And all works fine :-)
Thanks.

Multiple data in each cell in JTable

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